Page:Standard lettering (IA standardletterin01claf).pdf/47

 The Topographers' Scale

In standard lettering, as used in Topographic Drafting, the capital letters are laid out in "units" one seventh the height of the letters. As ordinary scales do not provide this unusual division of the inch, three-quarter inch, etc., a special scale has been devised and is now manufactured, giving seventh divisions for various heights of letters. On the opposite edge the tenth units are given for the lower case letters.